Examine source code of Beautiful

{
  "name": "Beautiful",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "BeautifulH1.jpg"
    },
    "colors": {
      "frame": "rgba(252, 239, 226, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(255, 243, 229, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 243, 229, 0.04)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(3, 3, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ffd6d0f8-542c-4a68-a627-c394e06b3c51}"
    }
  }
}